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Liquid silicone rubber eliminates post-curing.

Wacker has introduced its Elastosil LR 5040 line of liquid silicone rubber grades to fulfill the stringent regulatory requirements that apply to silicone articles in many medical-technology applications. Cured rubber products made of E-LR 5040 are said to feature excellent mechanical properties, even without thermal post-treatment, and contain very few volatile substances, allowing manufacturers to eliminate the post-curing step after fabrication, in many cases.

Thanks to their purity and good skin compatibility, silicones increasingly find use in medical-technology applications. The product is said to feature excellent tear strength after curing, allowing manufacturers of medical devices to dispense with thermal post-treatment in many cases.

E-LR 5040 cures to a translucent elastomer whose volatiles content, without thermal post-treatment, is below 0.5 weight percent. In its non-post-cured state, the silicone exhibits a high level of tear resistance equivalent to that of post-cured high tear strength standard materials. As a result, it can withstand such mechanical stresses as may occur in the usage of medical devices, for example.

These properties are said to make E-LR 5040 the material of choice when manufacturers want to dispense with thermal post-treatment altogether. Typical applications include anticolic valves, bottle tops or respirator masks.

The product line will initially cover a hardness range from 30 to 70 durometer A. In the cured state, the actual hardness of the non-post-cured silicone deviates from specification by only [+ or -]3 points. Elastosil LR 5040 can be readily processed by injection molding. Since molded parts no longer have to be post-cured in many cases, production processes can be greatly streamlined and automated to a high degree. This facilitates very rapid, efficient and cost-effective large-scale production, even under cleanroom conditions.

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Title Annotation:Silicone & Medical Update
Publication:Rubber World
Date:Jan 1, 2018
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